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  1. Alex Altu's Avatar
    Hello. I have a Nokia Lumia 830 and a DT-601 charging plate. When i charge the phone through the USB port, the battery drains by 0,3% per hour in idle. When i charge it through the pad, battery drains by over 1% per hour. I thought there was a process that remained open after the charging, so i restarted it , but to no avail, the battery keeps draining very fast. I repeated the process several times and the result is the same, with wireless charging the battery drains much faster. Does anyone know what the problem might be?
    12-20-2014 12:48 PM
  2. Harrie-S's Avatar
    So you fully charged it till 100%
    You disconnected it
    Did not use it for a few hours and than checked the battery level?
    And USB does that mean computer or wall-plug
    12-20-2014 01:56 PM
  3. Alex Altu's Avatar
    Yes 100%. When it was full, i removed it from the pad. In all the test, i did not use the smart functions, but let it idle for a few days, with every thing turn off, except the 3g connection, but with data turned off. By usb i mean the charger that came with the phone.
    12-20-2014 02:12 PM
  4. Harrie-S's Avatar
    Okay. But did you only check on the end from the test or did you check every day?

    I have seen the following. If I fully charge my phones they are charged "more" than 100%. Because if I disconnect them from a charger it takes much more time to go from 100 to 99 then from 99 to 98% (I did not time it but it is true).
    Charging with QI is "slower" then charging them with the phone charger (can be seen in reviews).
    How much the can be charger over 100% depends on the charger "strength" (mA).
    So if you charge them with QI the battery goes for example to 103% but with the charger it goes to 106%
    And if you only check on the end of your test it looks like the QI discharge faster but that is because it is less "over charged"

    Can above explain the difference you see?
    12-20-2014 02:33 PM
  5. Alex Altu's Avatar
    I check it quite often, about once every 2-3 hours. With usb charging the phone lasted about 10 days. With wireless, about 4-5. With wireless it draining faster to about 80% with 1-2% per hour, then slower, to about 1% per hour until empty. Much faster than the stable 0,3% per hour in the case of the usb charging.
    12-20-2014 02:48 PM
  6. Harrie-S's Avatar
    Okay with your last info my explanation is proven wrong and I have no idea why there is a difference.
    12-20-2014 03:00 PM
  7. Alex Altu's Avatar
    Could 100% charging from wireless be different from 100% charging through the wired charger? I don't know, some value to be smaller? Amps, watts, something?

    P.S. Seems i am not the only one with the problem:
    forums.windowscentral.com/nokia-lumia-920/212795-wireless-charging-battery-life.html
    forums.windowscentral.com/nokia-lumia-920/217599-wireless-charging-pad-vs-ac-plug.html
    forums.windowscentral.com/nokia-lumia-920/209348-wireless-charger-poor-battery-life-comparison-socket-charger.html
    forums.windowscentral.com/nokia-lumia-920/205369-wireless-charger-problem.html
    Last edited by Alex Altu; 12-21-2014 at 12:32 PM.
    12-21-2014 11:56 AM
  8. xandros9's Avatar
    That is so weird, I never noticed!
    12-21-2014 12:45 PM
  9. jojoe42's Avatar
    Interesting theory, that might explain why my battery now drains faster than before (I recently put a wireless charging plate at my desk).
    12-21-2014 12:56 PM
  10. th34monk3ys's Avatar
    My dt-900 is 2amp charger, with the wireless charging setups there is a 2% charging efficiency loss on the charging field itself, natural law of physics. The 600 maybe a weaker model!

    I do not have this problem on my 1520 I would like to point out!

    Another theory is quick charge vs proper charge, maybe the phone is not doing a proper charge on wireless?

    Sim cards etc will still search signals, weather can affect this, however I believe this isn't the culprit.
    12-21-2014 01:06 PM
  11. jojoe42's Avatar
    My dt-900 is 2amp charger, with the wireless charging setups there is a 2% charging efficiency loss on the charging field itself, natural law of physics. The 600 maybe a weaker model!

    I do not have this problem on my 1520 I would like to point out!

    Another theory is quick charge vs proper charge, maybe the phone is not doing a proper charge on wireless?

    Sim cards etc will still search signals, weather can affect this, however I believe this isn't the culprit.
    Actually, whilst the DT-900 may have an input current of 2A, the current Qi standard used means that there is only 1A outputted to charge the phone. I think someone said somewhere that battery percentage can't really be accurately estimated/reported when the rate of charge changes often...seems a little weird to be honest. Personally I think it might be a firmware/software glitch somewhere
    12-21-2014 04:16 PM
  12. JamesPTao's Avatar
    Actually, whilst the DT-900 may have an input current of 2A, the current Qi standard used means that there is only 1A outputted to charge the phone. I think someone said somewhere that battery percentage can't really be accurately estimated/reported when the rate of charge changes often...seems a little weird to be honest. Personally I think it might be a firmware/software glitch somewhere
    OEM qi chargers average around 70-80% efficiency. Off brand around 60%-70%.
    jojoe42 likes this.
    12-21-2014 04:29 PM
  13. Fred Wilson2's Avatar
    Yes, that's correct.
    Wireless charging is very inefficient.
    The conversion lose is output as heat.

    Fred


    OEM qi chargers average around 70-80% efficiency. Off brand around 60%-70%.
    jojoe42 likes this.
    12-21-2014 06:23 PM
  14. Sent UAMessage's Avatar
    to be fair without the wireless charging etc. on the android format on the samsung galaxy s4 the battery dies even before work so doesnt last around 8 hours so i think this pretty much is a havoc for all phones
    12-21-2014 06:26 PM
  15. th34monk3ys's Avatar
    Ok explain this using battery sense app, using 2amp dt900 and 2amp wall hugger charger. With wired cable I gain 20% charge per hour vs 17% on wireless on a Nokia Lumia 1520. Thus if this 60% rule was in place the dt900 would slowly charge a 1520 as 1520 comes with 1.5amp standard charger and 60% of 2amp would be around 1.2amp mark
    12-23-2014 07:20 AM
  16. JamesPTao's Avatar
    Ok explain this using battery sense app, using 2amp dt900 and 2amp wall hugger charger. With wired cable I gain 20% charge per hour vs 17% on wireless on a Nokia Lumia 1520. Thus if this 60% rule was in place the dt900 would slowly charge a 1520 as 1520 comes with 1.5amp standard charger and 60% of 2amp would be around 1.2amp mark
    The 60% is inaccurate. People are obviously just regurgitating numbers they've heard or pulling them out of their but. For a cheap off brand wi charger at worst maybe. For OEM 75% at worst but usually 80-85% is what to expect.
    12-24-2014 03:49 PM
  17. Harrie-S's Avatar
    Gentleman this thread did NOT start about loading efficiency but draining rate after the phone was charged to 100%. So can the loading efficiency influence the draining rate?
    xandros9 likes this.
    12-24-2014 04:17 PM
  18. pankaj981's Avatar
    Gentleman this thread did NOT start about loading efficiency but draining rate after the phone was charged to 100%. So can the loading efficiency influence the draining rate?
    Nope
    xandros9 likes this.
    12-24-2014 05:07 PM
  19. Alex Altu's Avatar
    I did another test yesterday. This time i did not remove the phone from the pad after it charged, but left it there for the entire night. The battery seems to be doing much better, on par with wall charging. But on many sites it is recommended to not overcharge the battery and remove it from the charger when it reaches 100%. dmediamom.com/2013/04/26/rechargeable-battery-problems/ . So what the hell? What is the percentage the battery could overcharge to notice such difference? And was that what i noticed ? Overcharging from the charger vs normal 100% from the wireless pad? If so 100% with no overcharging means very poor battery life.
    12-25-2014 02:27 AM
  20. Harrie-S's Avatar
    There is an overcharge protection which prevents overcharging.
    So with the overcharge protection "nothing" bad will happen to your battery. But it is always safer not to connect equipment longer than necessary to electricity to prevent that possible malfunctions can cause harm like damage your phone or even fire.

    What is the percentage the battery could overcharge to notice such difference?
    YOU CAN CALCULATE THAT WITH THE DATA YOU HAVE.

    And was that what i noticed ? Overcharging from the charger vs normal 100% from the wireless pad?
    NO IDEA BUT THAT WOULD EXPLAIN YOUR RESULTs.

    If so 100% with no overcharging means very poor battery life.
    12-25-2014 04:11 AM
  21. JamesPTao's Avatar
    I did another test yesterday. This time i did not remove the phone from the pad after it charged, but left it there for the entire night. The battery seems to be doing much better, on par with wall charging. But on many sites it is recommended to not overcharge the battery and remove it from the charger when it reaches 100%. dmediamom.com/2013/04/26/rechargeable-battery-problems/ . So what the hell? What is the percentage the battery could overcharge to notice such difference? And was that what i noticed ? Overcharging from the charger vs normal 100% from the wireless pad? If so 100% with no overcharging means very poor battery life.
    The warning is meant to protect the battery from damage. A connected plug can "trickle charge because of the flow of energy even though the battery is full. With qi this is not an issue because there is no direct connection and the circuit is turned off when it is full.
    12-25-2014 10:37 AM
  22. JamesPTao's Avatar
    Also if you take the phone off the qi pad when it says 100% it is actually at closer to 92%. Notice the qi charger light is still on (meaning it is still charging). When the qi pad light turns off, then it is truly at 100%.
    jojoe42 likes this.
    12-29-2014 02:19 PM

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